BSOD after installing new cpu fan??

i know lol, i think i am coming across as a stupid teenager due to my short, sometimes rude answers, and apparent ignorance whereas i am a final year biochem student in his 20s, who does literally try everything possible and available to solve the problem. i am simply requesting that somebody who is an expert in this bios help me troubleshoot the problem (the manual doesn't actually explain what anything means, it just says what everything is, in very shallow detail). i thank you all for your help and time so far though, i do appreciate it, its just have an exam in a couple of hours and would like to get the cd drive running again so i can run a mem test while i am doing the exam

i don't have another usb drive handy, although i really should, as mine is tiny and needs upgrading to a larger faster one. plus there is also the issue that I'LL NEVER BE ABLE TO USE CDs AGAIN haha, so I really really do need this issue solved very soon! i don't want to have to call up a guy to come round to fix it like the grandmas and grandpappys do haha, but at this rate i might need to!

mine doesnt have a esc option as far as im aware, its del to open up the bios, then f8 to bring up boot options. and no, doesnt think any other drive apart from the HDD is plugged in, and doesnt recognise it anywhere in the bios anymore, and have tried resetting to defaults to no avail. i feel i have literally tried everything, as usual.

only thing i havent tried doing is unplugged disc drive and plugging it back in lol which i am tempted to try tbh

s'what i was thinking to, its my last hope now possibly...

Already unplugged and replugged it all back, to no avail. I have checked the whole bios and nothing can get it to recognize any other drive but the hdd. I just have no clue what has happened and feel I've tried everything now.